Skyscrapers save space in cities, maximizing real estate for every square foot. But without a solid foundation and advanced building techniques, they could go from scraping the sky to dangerously unstable. How are skyscrapers built taller and more intricately every year? Below, we’ll take a look at the innovative skyscraper construction methods that keep our city’s architectural icons standing tall.
Steel Foundations
The first skyscrapers were built from wood and concrete, but all-steel foundation beams proved a boon to skyscraper construction. Concrete foundations become too heavy as their length increases, so architects needed a new material if they wanted to keep building upward. Because the comparatively light steel beams could hold up more weight, they would revolutionize skyscraper construction methods.
Sharing the Weight
In buildings like Chicago’s WIllis Tower, modern skyscraper construction methods involve a steel skeleton structure to distribute weight across the vertical beams that support the whole. These beams are riveted end-to-end to form vertical columns, which are connected to horizontal girder beams. The resulting grid structure, or skeleton, is known as the superstructure.
Consider the Elevators
How are skyscrapers built when you take elevators into account? Based on factors like the number of floors and expected occupancy, a skyscraper is required to have a certain number of elevators. However, this can complicate skyscraper construction because each elevator shaft takes up a good deal of space. Architects must consider every detail when it comes to the elevator shafts and stairways, and their position within the superstructure.
Catching the Wind
The higher you build, the more you need to worry about wind. So, how are skyscrapers built to handle blustery conditions many meters above the ground? Today’s innovative skyscraper construction methods employ design elements like small crannies, ornaments and nooks to catch and slow winds around the building. In addition, steel superstructures are designed to bend and flex with the wind.
Fly High At the Willis Tower Skydeck
Curious about Chicago’s impressive roster of history-making skyscrapers? Reach out to the team at Skydeck to learn more!
What materials are commonly used to build skyscrapers?
Modern skyscrapers are primarily built with steel, concrete, and glass. Steel provides the structural framework that allows buildings to rise hundreds of feet. Concrete is often used for floors and support columns. Glass façades give skyscrapers their modern look while allowing natural light into the building.
How do engineers make skyscrapers strong enough to withstand wind and weather?
Engineers use deep foundations, steel frameworks, and reinforced concrete to keep skyscrapers stable. Buildings are carefully designed to handle heavy winds, snow, and shifting soil conditions. Aerodynamic shapes also help reduce wind pressure. These combined techniques allow skyscrapers to remain both safe and durable.
How long does it typically take to build a skyscraper?
The construction timeline for a skyscraper varies depending on height and design complexity. A typical high-rise may take three to five years to complete. Taller or more advanced structures can take closer to a decade. Planning and engineering often begin years before construction starts.